Elroch - what map are you referring to as there are many maps and the constellations were mapped out long before heliocentric theory came along which usurped science replacing it with pseudoscience.
I am talking about a map of the sky that has stars that are near to each other near to each other. The same way maps generally work.
If you want to get the distances between stars to be proportional to the angles between the stars in the sky, you are limited to a spherical map - like printing the stars on the surface of a ball where the Earth would be at the centire - but the main point is that you CANNOT distort the distances in any way that retains proximity without CUTTING the representation of the sky.
If this is all too difficult for you, there is a hemisphere of stars that lie above the celestial equator - the region where the planets and the Sun and Moon are found. There is another hemisphere of stars that lie below the celestial equator (these are the stars that are visible everywhere in the Southern hemisphere). When you join these two hemispheres together (they share the celestial equator) you get a topological sphere.
In the fantasy flat Earth world - the one you believe in - there would be no problem at all with having a flat map of the stars "above" the Earth, because you can't see "under" the Earth. No flat Earther has ever produced such a map with all the stars on it, because it is impossible. None of them are bright enough to realise that means they are wrong.
Still too difficult?
Let me present this in an alternative way. In your fantasy world, there is a circular edge to the distribution of stars we can see, right?
There is no such edge when you piece together what people see from different locations - the stars just keep on going until you have gone all the way round the sky and come back to where you started.
Again, perfectly clear to me but, with all due respect, probably beyond you.
But here is a map of the ENTIRE sky that you can rotate. It is designed to be used in a location so parts of it are darkened, but the constellations are still there. And it is a spherical distribution of stars, of course. The North pole of this sphere is near the North Star, Polaris. To help you navigate, this is the bright star at the end of Ursa Minor, and it will stay still in the map as the sky rotates around it.
The South Pole is in the region of the sky that is the apex of the Southern hemisphere sky.
It's somewhere near this guy on the map (you will see the sky rotates around a point near this guy, as people in the Southern hemisphere see.
Oceans of mercury????!!!. Where do they get that from, oh yeah, the planet Mercury
uranium comes from Uranus and plutonium comes from Pluto
No, no oceans of mercury on Mercury.